Fix public flags not updating

[LucasCoderT]

Summary

Fixes #6288

_update_inner_user Now properly checks if the user public flag data has changed

Checklist

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)

[Rapptz]

This implementation still doesn't work since the User._copy method does not copy over the _public_flags field.

[Rapptz]

LGTM.